A novel concept of pseudo ternary diffusion couple for the estimation of diffusion coefficients in multicomponent systems

TL;DR

This paper introduces a pseudo ternary diffusion couple technique that simplifies the estimation of composition-dependent interdiffusion coefficients in multicomponent systems, overcoming limitations of conventional methods.

Contribution

It presents a novel method that simplifies complex calculations in multicomponent diffusion analysis by focusing on three components with variable profiles.

Findings

Enables estimation of composition-dependent diffusion coefficients in multicomponent systems.

Overcomes mathematical complexity of Onsager formalism in such systems.

Applicable to systems with any number of components under specific conditions.

Abstract

A pseudo ternary diffusion couple technique in a multicomponent system by simplifying the mathematical complications of Onsager formalism is proposed for the estimation of composition dependent values of the interdiffusion coefficients. This is otherwise impossible following the conventional method in a system with more than three components. Other alternative methods estimate the average diffusion coefficients over a composition range of random choice and lack physical significance. This method can be followed in a multicomponent system with any number of components on the condition that only three components develop diffusion profiles keeping others as constant.